Seems the Silurian warriors, at least from what we saw in the trailer for next week, are all female. Either that or modified mini are part of the uniform for all.
The uniforms of the Silurian soldiers in the trailer for next week remind me of the tunics worn by (male) soldiers in the Roman Empire. It wouldn't surprise me if the costume department had that in mind when designing the uniforms.
From what I can tell in the trailer, there's only one Silurian soldier speaking, who just happens to be a woman. It's possible that the Silurian military has males and females, and it just happens that their commander is female.